Vibration Control Device Steering Angle Velocity Compensation
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Solution Overview
Problem
Existing vibration damping control systems for vehicles face challenges in maintaining effective vibration suppression during turning, leading to discomfort for drivers due to rapid changes in yaw rate and nose-down or nose-up attitudes, as they adjust wheel torque to counteract pitch and bounce vibrations.
Innovation Solution
A vibration damping control device that reduces the amplitude of the compensation component for wheel torque as the steering angle velocity increases, using a control gain that decreases with steering angle velocity, ensuring continuous adjustment of the vibration damping effect without sudden changes, thereby maintaining a stable yaw rate response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compensation component for wheel torque is increased to suppress pitch and bounce vibrations during turning, then vibration damping effect is improved, but the yaw rate response becomes too rapid causing driver discomfort
Solution Approach 1:
The control gain for the compensation component is made dynamic by adjusting it according to the steering angle velocity. When steering angle velocity exceeds a threshold, the control gain is reduced, allowing the system to adapt its damping strength based on turning conditions, thus preventing excessive yaw rate changes while maintaining vibration suppression during normal operation
Solution Approach 2:
The patent changes the control parameter (control gain) based on the steering angle velocity condition. By switching the control gain value according to whether the steering angle velocity exceeds a predetermined threshold, the system optimizes the compensation component magnitude to balance vibration damping effectiveness with driver comfort during turning maneuvers
2Ease of operation
If the vibration damping control is stopped when steering angle velocity is high, then driver comfort is improved, but vibration suppression capability is lost
Solution Approach 1:
Instead of completely stopping the vibration damping control when steering angle velocity is high, the system applies a reduced control gain to the compensation component. This partial action maintains some vibration suppression capability while reducing the intensity enough to prevent excessive yaw rate changes, thus balancing both driver comfort and vibration suppression needs
3Force
If the drive torque is increased to compensate for wheel torque reduction during turning, then wheel torque is maintained, but the vehicle turns quickly causing driver insecurity
Solution Approach 1:
The control gain is dynamically adjusted based on steering angle velocity to modulate the compensation component magnitude. During rapid steering when angle velocity exceeds the threshold, the reduced control gain limits the compensation component, preventing excessive drive torque increase and the associated rapid vehicle turning that would cause driver insecurity
Solution Approach 2:
The system uses steering angle velocity as feedback to determine the appropriate control gain level. This feedback mechanism allows the system to sense the turning rate and automatically adjust the compensation component magnitude accordingly, preventing over-correction that would lead to rapid vehicle response and driver discomfort
Data Source
AI summary
A vibration damping control device that controls drive output of a vehicle so as to suppress pitch/bounce vibration of the vehicle includes a vibration damping control unit that controls driving torque of the vehicle so as to reduce an amplitude of the pitch/bounce vibration, based on wheel torque applied to wheels of the vehicle and generated at a location where the wheels contact with a road surface, and a compensation component adjusting unit that reduces an amplitude of a compensation component that corrects the wheel torque calculated by the vibration damping control unit so as to suppress the pitch/bounce vibration, as the magnitude of the steering angle velocity of the vehicle increases.